Steam-boiler furnace



of the` series of heating plates. Fig. 5 is a transverse, vertical, sectional view on the line UNITED STATES PATENT OEEICE.

ENOCH RENSLOW ROLFE HOYT, OF 'BROOKLYNpNEW YORK.

STEAM-BOILER FU RNACE.

SPECIFICATION forming part of Letters Patent No. 528,229, dated October 30, 1894. Application iiled June 6, 1894. Serial No. 513,685. (No model.)

useful Improvements in Steam-BoilerFurnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and` use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification. h

My invention relates to improvements inl steam boiler furnaces and the object of the invention is to provide a furnace in which the carbon distilled by the combustion of fuels commonly employed will be 4combined with heated oxygen and t thus form carbonio acid or carbon dioxide.

A further object` of myinvention is to insure the uniform heating of the air admitted into the furnace for the purpose of supplying the necessary oxygen.

With these and other ends in View my invention consistsin the combination with the combustion chamberand bridge wall of afurnace, of a series of heating plates arranged in rear of the bridge Wall and forming a series of air passages, a cover plate arranged over the space between the bridge wall and heating plates, a iiuearranged to conduct air to the chamber between the bridge wall and heating plates, and a damper for regulating the exit of airfrom such chamber. h t u My invention further consists in the peculiar construction and arrangement of parts as will be hereinafter more fully pointed out and claimed. i

In the 'accompanying drawings:,-Figure l is a vertical, longitudinal, sectional View through a tubular steam boiler and its furnace with my improvements applied thereto. Fig. 2 is a front elevation of thesame with the front wall removed. Fig. 3 is a plan view of the bridge wall and a portion Iof the combustion chamber. Fig. 4 is a front elevation w a: of Fig. et. Fig. 6 is the rear elevation of the heating plates. Figs. 7, 8 and 9 are, re-

spectively, detail plan, front elevation` and rear elevation of one of the interior plates of the series of heating plates.

: Like letters of reference denote corresponding parts in all the figuresof the drawings,

A designates the wallsof the furnace and `support or setting for the boiler, B, both of which and the grate, C, in the combustion chamber of the furnace maybe of any suitable and desired size, style and material. The rear face of the bridge wall is, preferably, inclined as shown in Fig. l, and in rear of such wall I arrange a series of heating plates, E, and the chamber, F, formed between the bridge wall and said heating plates is covered by a metallic cover plate, G. The upper surface of the bridge wall is cut away at the rear end thereof to form a seat for the forward end or edgeof the plate, G, which is preferably provided" with a series of longitudinal grooves or corrugations, g,

The heating plates, E, are arranged to form a series of horizontal air passages, K, and in the bridge wall are formed a series of fines,

H, which connect the chamber, F,with the space below the grate, C. h

The air passages, K, are formed by aligned grooves formed in the contiguous faces or sides of adjacent heating plates; and, as shown in Figs. 5 and 7 of the drawings, such passages graduallyincrease in breadth and decrease in height from their forward to their rear ends. Thus, the forward ends of the air passages, K,are substantially circular in cross section while at therear of the heating plates Such passages appear as narrow slits or elongated parallelograms. The grooves on the facesof the plates (except the outside ones) are not opposite each other but are intermediate between those on the other side of the plate, so thatwhen the plates are assembled the air passages between every pair of plates will lie in dierent vertical planes from the horizontal rows of air passages next above and below. The top and bottom plates of the series are provided with grooves on only one face as shown'. t

`The plates, E, are made of different `widths and so arranged that the rear end or edge of each plate projects slightly beyond the corresponding end or edge of the next lowest plate IOC) of the series. By this construction, which is more clearly shown in Fig. 5 of the drawings, the air escaping from the air passages formed by said plates comes in contact with these overhanging or projecting ends, which are the hottest portions of the plates, the air being therefore subjected to the greatest heat as it escapes from the air passages. Such projecting edges also prevent the narrow rear ends of the air passages from being filled or clogged by dust.

In order that the volume of air passing through the passages, K, formed by the plates,

E, and that all of the air may be deflected against the cover plate, G, I arrange a damper, L, within the chamber, F, between the bridge wall and heating plates. To the damper is connected one end of an arm, M, the other end of which is connected to an operating rod, N, which extends through the front wall of the furnace, so that the damper may be easily operated.

Although I have shown and described my improvements as applied to a particular kind of furnace I do not wish to be understood as intending to limit myself to the particular construction shown as I am aware that my improvements may be advantageously applied to other forms of furnaces and I therefore reserve the right to make such modifications as may fairly fall within the scope of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In afurnace, the combination with a combustion chamber and bridge wall, of a series of heating plates arranged in rear of the lbridge wall and forming the rear wall of a heating chamber a series of air passages, a corrugated plate arranged across the chamber between the bridge wall and heating plates, and a due arranged to conduct air from below the grate of the furnace to the chamber between the bridge wall and the wall formed by the heating plates, substantially as shown and described, for the purpose specified.

2. In afurnace, the combination with a combustion chamber and bridge wall, of a series of heating plates placed upon each other arranged in rear of the bridge wall and provided With a series of air passages which increase in width and decrease in height from their forward to their rear ends, a plate arranged over the space between the bridge wall and the wall formed by the heating plates, and a iue arranged in the bridge wall to conduct air from below the grate in the furnace to the chamber between said bridge wall and heating plates, substantially as hown and described, for the purpose speci- 3. In afurnace, the combination with a combustion chamber and bridge wall, of a series of heating plates arranged in rear of the bridge wall and forming the rear wall of a heating chamber a series of air passages, formed in said plates, a corrugated plate covering the space between the bridge wall and the wall formed by the heating plates, a damper arranged in the chamber between such plates and bridge wall controlling the exit ofthe air from said heating chamber, and a flue arranged to conduct air to such heating chamber, substantially as shown and described, for the purpose specified.

4:. In a f urnace,the combination with a combustion chamber and bridge wall, of a series of heating plates arranged in rear of the bridge wall and forming a series of air passages, said plates being of different widths and arranged so that the rear end of each plate projects slightly beyond the corresponding end of the next lowest plate in the series, a plate arranged over the space between the bridge wall and heating plates, and a flue arranged to conduct air to the heating chamber formed between the bridge wall and heating plates, substantially as shown and described.

5. In afurnace,the combination with a combustion chamber and bridge wall, of a-series of plates arranged in rear of the bridge wall and having `grooves formed in their upper and lower faces, whereby when the plates are assembled a series of air passages are formed between every pair of plates, said passages increase in width, and decrease in height from their forward to their rear sides, a cover plate arranged over the space between the bridge wall and heating plates, and a due arranged to conduct air from below the grate in the furnace to the heating chamber formed between the bridge wall and heating plates, substantially as shown and described, for the .purpose specified.

6. In a furnace,the combination with a combustion chamber and bridge wall, of a series of heating plates arranged in rear of the bridge wall and having grooves formed in their faces, whereby when the plates are assembled a series of air passages are formed between each pair of plates, the passages between each pair of plates being out of vertical alignment with the passages next above and below them, a cover plate arranged over the space between said plates and wall, and a flue arranged to conduct air from below the grate in the furnace to the heating chamber formed between the bridge wall and heating plates, substantially as shown and described, for the purpose specified.

7. ln a furnace, the combination with a combustion chamber and bridge wall, of a series of plates arranged in rear of the bridge wall and forming a series of air passages which increase in width and decrease in height from being of diderent widths and so arranged IOO their forward to their rear ends, said plates thattherearendofeachplateprojeetsslightly in said heating chamber, substantially as 1o beyond the rear end of the next lowest plate shown and described, for the purpose speciinthe series, a metallic plate arranged over ed. the heating chamber formed between the In testimonywhereoflafix my signature in brige wall and heating plates, a series of presence of two witnesses.

lines arranged in the bridge wall to conduct ENOGH RENSLOW ROLFE HOYT. air from below the grate in the furnace to Witnesses: the heating chamber between the bridge wall ERNEST A. DU VAL,

and heating plates, and a damper arranged WILLIAM S. H. ROBINSON. 

